Global Positioning System Reference
In-Depth Information
Bandwidth, predetection integration time, jerk
2 Hz, 20 ms, 0.01 g/s
10 Hz, 20 ms, 1 g/s
18 Hz, 20 ms, 10 g/s
20
18
16
15 degrees, 1-sigma threshold
14
12
10
8
Frequency = 1575.42 MHz
Oscillator specifications:
Allan deviation = 1 10
Vibration sensitivity = 1
11
6
×
9
10
×
2
4
Vibration = 0.005 g /Hz
from 200 to 2000 Hz
2
0
15
20
25
30
35
(
C/N 0dB
)
(dB-Hz)
Figure 5.24
Total PLL jitter for third-order carrier loop.
for the dynamic stress at threshold. Figure 5.25 illustrates the dynamic stress at
threshold as a function of noise bandwidth for a third-order PLL.
(
C/N 0dB
)
= 24 dB-Hz
(
C/N 0dB
)
= 35 dB-Hz
(
C/N 0dB
)
= 28 dB-Hz
20
20
18
18
Frequency = 1575.42 MHz
Oscillator specifications:
Allan deviation = 1 10
Vibration sensitivity = 1
16
16
11
×
9
10
×
14
14
2
Vibration = 0.005 g /Hz
from 200 to 2000 Hz
12
12
10
10
8
8
6
6
4
4
2
2
0
0
123456789 0 1 2 3 4 5 6 7 8
Noise bandwidth (Hz)
123456789 0 1 2 3 4 5 6 7 8
Noise bandwidth (Hz)
Figure 5.25
Jerk stress thresholds for third-order PLL.
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